Teaching Haryana (HPSC) PGT Mock Test 2024 Mathematics Three Dimensional Geometry Direction ratios and Direction cosines

l2 + m2 + n2 का मान क्या है? जहाँ l, m और n रेखा के दिशा कोसाइन हैं । 

1
1
2
-1
3
2
4
0
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